Versatile telluracycle synthesis via the sequential electrophilic telluration of C(sp<sup>2</sup>)–Zn and C(sp<sup>2</sup>)–H bonds
作者:Bin Wu、Melvina Melvina、Xiangyang Wu、Edwin Kok Lee Yeow、Naohiko Yoshikai
DOI:10.1039/c7sc01162h
日期:——
We report herein a new approach for the synthesis of tellurium-bridged aromatic compounds based on the sequential electrophilic telluration of C(sp2)–Zn and C(sp2)–Hbonds with tellurium(IV) chlorides. A combination of transition metal-catalyzed (migratory) arylmetalation of alkynes and sequential telluration allows for the expedient construction of a library of functionalized benzo[b]tellurophenes
我们在此报告了一种新的合成碲桥接芳族化合物的新方法,该方法基于C(sp 2)-Zn和C(sp 2)-H键与碲(IV)氯化物的顺序亲电碲化。炔烃的过渡金属催化(迁移)芳基金属化和连续碲化相结合,可以方便地构建功能化的苯并[ b ]碲二苯酚文库。此外,可以容易地从相应的2-碘杂双联芳基合成各种杂芳基稠合的苯并二氮杂苯并与其他新颖的碲嵌入的多环芳族化合物。
Divergent ring-opening coupling between cyclopropanols and alkynes under cobalt catalysis
作者:Junfeng Yang、Yixiao Shen、Yang Jie Lim、Naohiko Yoshikai
DOI:10.1039/c8sc02074d
日期:——
promote ring-opening coupling reactions between cyclopropanols and unactivated internal alkynes, affording either β-alkenyl ketones or multisubstituted cyclopentenol derivatives in good yields with good to excellent regioselectivities. The chemoselectivity between these β-alkenylation and [3 + 2] annulation reactions, which likely share a cobalt homoenolate as a key catalytic intermediate, is exquisitely
Mild and Efficient C2-Alkenylation of Indoles with Alkynes Catalyzed by a Cobalt Complex
作者:Zhenhua Ding、Naohiko Yoshikai
DOI:10.1002/anie.201200019
日期:2012.5.7
Direct alkenylation of the C2‐position of indoles bearing an easily removable N‐pyrimidyl group with alkynes has been achieved by using a cobalt catalyst complexed with a phosphine–pyridine bidentate ligand. This reaction has wide substrate scope and is highly efficient and stereoselective at room temperature. The alkenylated indoles serve as useful platforms for further synthetic transformations (some
Versatile Synthesis of Benzothiophenes and Benzoselenophenes by Rapid Assembly of Arylzinc Reagents, Alkynes, and Elemental Chalcogens
作者:Bin Wu、Naohiko Yoshikai
DOI:10.1002/anie.201304546
日期:2013.9.27
Rapidly aSSembled: The combination of cobalt‐catalyzed migratory arylzincation and copper‐mediated/catalyzed chalcogenative cyclization allows the construction of benzothiophenes and benzoselenophenes from arylzincreagents, alkynes, and elementalchalcogens. Benzothiophenes and benzoselenophenes diversely functionalized at the benzene ring moiety can be prepared, which are not readily accessible by